FB3125 - 125Amp Circuit Breaker

FB3125 - 125Amp Circuit Breaker

When your breaker fails, the priority is usually getting the equipment back online with a replacement that matches the original installation. The FB3125 is a 125 Amp, 3-pole FB thermal-magnetic circuit breaker intended for use in compatible legacy electrical systems where maintaining the original design matters. Its physical dimensions, electrical ratings, and fixed trip characteristics make it a practical choice for repairs, scheduled maintenance, and replacement projects.

Inside the breaker, two different trip mechanisms work together to protect the circuit. The thermal element reacts when a circuit carries too much current for too long, while the magnetic trip responds almost instantly during a short circuit or other high-current fault.

Key Features and Benefits

• Form, fit, and functional replacement for compatible FB electrical systems
• 125 Amp, 3-pole thermal-magnetic circuit breaker
• Thermal protection helps prevent damage from sustained overloads
• Magnetic trip responds quickly during short-circuit conditions
• Non-interchangeable trip unit with factory-set trip characteristics
• Rated for operation in ambient temperatures up to 40°C
• Includes load terminals
• Built to last for continued service in compatible legacy electrical equipment

Technical Specifications

• Part Number: FB3125
  
• Type: FB
  
• Circuit Breaker Type: Thermal-Magnetic
  
• Amperage: 125 Amps
  
• Poles: 3
  
• Interrupting Rating: 14kA @ 480VAC; 25kA @ 240VAC
  
• Trip Unit: Non-Interchangeable
  
• Ambient Rating: 40°C
  
• Load Terminals: Included
  
• Dimensions:
  • Height: 6.00"
  • Width: 4.13"
  • Depth: 3.38"
• Dimensions: 4.13"W × 6.00"H × 3.38"D
  
• Approximate Shipping Weight: 5.50 lbs.
  

Material Compliance and Certifications

No material compliance or certification information has been provided for the FB3125. Before installation, verify that the breaker's ratings and configuration match the equipment being serviced. Installation should be completed by a qualified electrician in accordance with the National Electrical Code (NEC), applicable local electrical codes, and the original equipment manufacturer's recommendations.

Where It Works Best

The FB3125 is commonly used in commercial, industrial, and institutional facilities that continue to operate compatible FB electrical distribution equipment. It is well suited for protecting three-phase feeders, HVAC systems, pumps, compressors, motor loads, and general power distribution circuits where maintaining compatibility with existing equipment is the goal.